/Investor DB

QDNL Participations — Full Portfolio

15 tracked investments · listed companies and verified rows first

Diffraqtiondiffraqtion.com

Diffraqtion develops a "Quantum Camera" using passive optics that encode the physical structure of light, paired with AI that decodes the output to perform perception tasks beyond conventional sensor limits.

AI & Machine LearningDeep TechSpace TechSomerville, US

Saikat Guha(Co-founder)

Co-investorsCollaborative FundHEC Paris IncubatorMilemark Capital Partners

EuQlideuqlid.io

EuQlid builds magnetic imaging technology that uses quantum defects in diamond to non-invasively map buried electrical currents and identify connectivity defects in materials and devices.

Deep TechQuantum ComputingSemiconductors

Sanjive Agarwala(CEO and Co-Founder)inDavid Glenn(CTO and Co-Founder)inRonald Walsworth(Co-Founder)

Co-investorsQuantonation

Modemmodem.devin𝕏Jan 2024

Modem is an AI teammate for product and engineering teams that clusters and prioritizes customer feedback, bug reports, and feature requests from support and chat tools, then creates tickets, delegates tasks to coding agents, and generates user-tailored release notes.

AI & Machine LearningDeveloper ToolsSaaS

Ben Vinegar(Founder)in

Co-investorsInovia CapitalAccelDelft Enterprises B.V.QuantonationSpeedinvest

Orange Quantum Systemsorangeqs.comin𝕏

OrangeQS provides automated testing and characterization equipment and software for quantum chips with several to hundreds of qubits.

Deep TechHardwareQuantum Computing

Co-investorsCottonwood Technology FundQbeat VenturesEuropean Innovation Council Fund

Q*Birdq-bird.cominMay 2024

Q*Bird develops quantum key distribution (QKD) devices and networks for secure data communication using quantum technology, serving commercial and industrial clients including financial institutions, telecommunications companies, and data centers.

CybersecurityEnterprise SoftwareHardwareQuantum ComputingDelft, NL

Ingrid Romijn(CEO)inRemon Berrevoets(CTIO)inJoshua Slater(CTO)in

Co-investorsBorski FundCottonwood Technology Fund

Qbloxqblox.comin

Qblox develops industrial-grade control electronics for quantum computing systems, enabling error correction and scalable deployment in production environments.

Deep TechEnterprise SoftwareHardwareQuantum Computing

Co-investorsBootstrap EuropeQuantonation

QphoXqphox.euin

QphoX develops optical control systems and cryogenic switch controllers for quantum computing and research, enabling RF signal delivery to extreme cryogenic environments while minimizing thermal loss.

Deep TechHardwareQuantum Computing

Co-investorsQAI VenturesQuantonation

QT Senseqtsense.cominFeb 2025

QTSense develops quantum sensors operating at the nanoscale to detect subtle biological signals for research and diagnostic applications.

AI & Machine LearningBiotechDeep TechMedical Devices

Deepak Veeregowda(CEO)inSeyyed Taheri(CTO)Romana Schirhagl(CSO)inHoang Nguyen(COO)in

Co-investorsCottonwood Technology Fund

Quantwarequantware.cominMar 2025

QuantWare designs and manufactures quantum processors (QPUs) for industrial applications.

Deep TechHardwareQuantum ComputingSemiconductorsNetherlands, NL

Matt Rijlaarsdam(Co-Founder & CEO)inAlessandro Bruno(Founder)Matthijs Rijlaarsdam(Founder)

Co-investorsFORWARD.oneGraduate EntrepreneurIn-Q-TelRotripETF PartnersIntel Capital+1 more

Rhonexumrhonexum.comApr 2026 · $1M

Rhonexum works on quantum computing technology, focusing on the technical challenges of controlling qubits that must be kept in cryogenic refrigerators far colder than room temperature.

Deep TechHardwareQuantum Computing

Co-investorsHEC Paris IncubatorKickfundVenture Kick

Sygaldry Technologiessygaldry.comin𝕏Seed · Mar 2026

Sygaldry develops quantum-accelerated AI servers that combine multiple qubit modalities to speed up training and inference for AI models.

Advanced ManufacturingAI & Machine LearningHardwareQuantum ComputingAnn Arbor, US

Chad Rigetti(Founder)inIdalia Friedson(Founder)in

BoardChristian Garcia(Director)inAndrew Sather(Director)inMichael Keiser(Founder)

Co-investorsAlumni VenturesBloomberg BetaCollaborative FundDetroit Venture PartnersEarth Venture CapitalExpeditions+51 more

Telescopetrytelescope.ioinJan 2026 · $4.2M

Telescope is an AI-powered lead generation platform that identifies prospect companies similar to a user's best customers through lookalike matching.

AdTechAI & Machine LearningSaaSSales TechLondon, GB

Co-investorsMento vcADIN

Other

Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.

ESGQuantum ElementsSiC Systems

Rows marked “SEC filing” are inferred from directors named on the company's SEC Form D — public regulatory data, not a portfolio list published by the firm.